You need to unplug the advance wire located on the firewall on the passenger side under the plastic cover. It is brown with a black tracer then set the timing to 0 (zero). Plug it back in, reset the computer and you should be done.
what are the torque specs for a head on a 2.2 liter gmc sonoma
The 4.3 liter V6 engine in a 2003 GMC Safari has a timing CHAIN
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Timing chain
In a 2004 GMC Envoy both the 4.2 liter six cylinder and the 5.3 liter V8 engines use a timing CHAIN
The timing should be set at 0 degrees.
35
"0" or top dead center. I have a 1994 gmc picckup same thing
Look on the vehicle emissions control label it is there.
The computer should set the timing automatically by the sensors. If you change it, it must be done with a handheld computer.
the firing order for a 1992 gmc sierra c1500 v6 4.3 liter is 1-3-5 drive side front to rear 6-4-2 passenger side front to rear
I Don't Know Sorry